Pumping unit



Jan. 24, 1933. w. c. TROUT 1,895,181

PUMPING UNIT Filed Dec. 15. 1930 2 Sheets-Sheet 1 N 9 to i Q l m \l a YI n o 8' I 8 2 coco N E5 Q R52 is 5 a l 2i I Jvwmtoc If] WALTER G.TROUT.

5 map.

- 24', 1933. w, c, TROUT 1,895,181

PUMPING UNIT Filed Dec. 15, 1930 2 Sheets-Sheet 2 WALTER 'G. TROUT m W I60M Map.

UNITED STATES PATENT OFFICE WALTER O. TROUT, OI LUI'KIDT, rms

PUMPING Um Application fled December 15, 1980. Serial Io. 508,407.

The invention relates to an improvement in pumping units of the typegenerally used in connect1on with recovering oil or water from wells.

5 Various types of pumping units have been placed in commercial useheretofore and have embodied a power unit and crank assembly. This unitwould be mounted on a permanent foundation such as concrete and used inconnection with the Samson post and walking beam which were mounted onthe derrick foundation. Such devices, however, have been found in manyinstances to be unsuitable as the Samson post and the walking beam aremounted on one foundation and the pumping unit on a separate foundationand unless the expense and forethought were resorted to in order toprovide a suitable foundation for both portions of the pumping apparatusat the time the derrick was built,

considerable additional expense and inconvenience were generallyencountered. Great difiiculty was also encountered in properly aligningthe foundations where they were embodied separately and various otherdifliculties directly traceable to this setup of conditions wereencountered.

The present unit has been devised with the idea in mind of providing amechanism as a o unitary structure mounted on a frame work or skids sothat it might be readily transported from place to place and disposed onthe derrick foundation or drilling platform and still have the assurancethat all of the parts would be in proper alignment and 1n position toaccomplish their function.

It is one of the objects of the invention to provide a simple andeconomical pumping unit which embodies a source of power, crank, pitman,walking beam, Samson post and supporting structure, all assembled andcapable of transportation as a unit.

Another one of the objects is to devise a composite portable pumping ordrilling unit Hhich may be disposed on the well derrick oor.

Another object of the invention is to provide a pumping unit including adriving mechanism, crank, pitman, walking beam and Samson post soarranged with respect to each other that the ma be mounted u on skidsand located 0% th derrick floor 0% a well drilling rig.

Another object of the invention is to provide a pumping unit havin acounterbalance mechanism disposed on eac end of the crank shaft.

It is also an object of the invention to rovide a pltman for pumpingunit whic is adapted for connection to crank arms disposed in oppositeends of the crank shaft.

St ll another object of the invention is to provide a pitman having ayoke formation so that it may be connected to two wrist-pins.

It is also an object of the invention to prov1de a walking beam having asaddle extend- 1ng beyond and connected to the underside of the beam.

A still further object of the invention is to provide a counter balancemechanism for 0 both ends of the crank shaft in connection with an oilwell pumping unit.

It is also intended to provide a novel bearmg structure for connecting ayoke shaft pitman to the walking beam.

Other and further objects of the invention will be readily apparent tothose skilled in the art to which the invention appertains when thefollowing description is considered with the accompanying drawingswherein:

Fig. 1 is a side elevation of a complete assembly of the improvedpumping unit.

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 3 and showingthe internal construction of the pitman connection with 35 the walkingbeam.

Fig. 3 is an end elevation of the pumping unit looking from the lefthand side of Fig. 1 with the Samson post omitted.

Fig. 4 is an end elevation of the structure looking from the right handside of Fig. 1. The present pumping unit is particularly adapted forcongested drilling conditions where the derrick or other structures donot permit of distribution of the parts over a considerable area andalso adapts itself forconditions where the derrick is disposed overbodies of water or marshy land. Where the derrick must be erected uponpiling, and a pumping unit of the type now in general use is to beemployed, it is necessary to erect an additional foundation forthepumping unit but with the unit disclosed in this agiphcation it isintended that no additional oundation need be erected as the unit may bedisposed upon the derrick floor and is so balanced due to the provisionof the double counter wei ht structure that vibration 'is practically eiminated.

' tional cross bracing? may be provided on the upper flanges of t emembers so that they will form a frame work to sup ort the Samson post7, the power un t 8, t e gear unit 9 and counterbalances 10. The Samsonpost 7 is shown as connected to the supporting structure by means ofplates 12 which may be bolted or otherwise fastened to the support.

The Sampson post includes a triangular frame member having the braces 13and 14 on one side andthe central brace member 15 on the opposite side.These braces converge believe and are received by the saddle 16 whichsupports the center iron 17. On the center iron 17 is mounted thewalking beam 18 which is adapted for reciprocation by means of thepitman 19. The end of the walking beam opposite from the pitman recelvesa temper screw or bridle 20 which is adapted for connection to a cablefor the standard method of drilling or to a string of sucker rods forpump- F'he gear unit 9 may be of any desired construction and embodiesspeed reducing gears or the herring bone gears which are now in generaluse. Thesegears reduce the s the operating motor 8 which'drives t e belt21 connected to the drive wheel 22'. This drive wheel is mounted on ashaft 23 which drives the gears inside of the unit. The last gear ofth1s train is connected to the crank shaft 24 which carries the cranks25. As seen in Figures 3 and 4, there are two cranks 25, one mounted oneach end of the crank shaft which rejects from the gear unit 9. It is dthat this is a novel construction in a pumping unit of the resent typeand is of particular advantage m a small unit because it eliminateswhipping of the crank sha and'vibration of the entire unit.

The particular structure of the cranks 25 I is not important to thepracticing of the present invention but they may be of the typedofconfined in the slots 28 so that the wei ht may be movedlongitudinally of the era 25 to dust its eounterbalanc' or balancingefiect upon the weight of the and fluid column in the well.

The cranks 25 are provided with a plurality of openings 28 each of whichis ada ted to receive the crank or wrist pin 29, to w ich the itman 19is to be connected. The ar-' ticu ar opening 28 in which the pin 29 isto be disposed is governed by the length of the stroke which is to bemade in the pum ing or drilling operation. The pitman 19 is connected tothe crank pin 29 by means of a releasable vbearin 30.

The pitman 19 is of a special construction in order t at it may straddlethe gear unit and cranks and be connected on opposite sides and in thismanner balance the entire unit. As seen in Fi res 3 and 4, the pitmanincludes an invert U-shaped rod ortion provided with a cross brace 36 anhaving one of the bearingvor rod clamps 30 connected at each end. iththis arrangement it will be readily apparent that the entire unit may besymmetrically disposed with respect to the walking beam 18 which willthus oscillate in the plane along-the center line of the pumping unit.This is of material advantage as the unit may be located directlybeneath the walking beam instead of to one side as is now the generalpractice. With the stresses occurring symmetrically with respect to thepumping unit, the load may be readily balanced and enormous economiesefiected in reduction of the unit due to the fact that t e variouspartsthereof may be constructed of much lesser weight and strength asthe are not subjected to vibration and strains w ich have heretoforebeen encountered.

The pitman 19 is connected to the walking beam as best seen in Fi land 3by means' of a bracket 40 which 1s suitably connected to the walkingbeam 18 and is here illustrated as including the flanges 41 and 42 whichembrace the end of the walking beam in order to insure a rigidconnection. Angle plates 43 are fastened to the web 44 of the walkingbeam in order to receive the flange 42. This bracket 40 has an outwardand downwardly extending arm 45 which is formed with a socket 46 inorder to receive the ball member 47 which is carried by the pitman rod35. This ball'member is shown in section in Fig. 2 and includes the ball48, stem 49 and the yoke 50. The ball 48 is received in the socket 46 ofthe arm 45 and is retained in position by a pair of clamping plates 51which are con-g nected to the arm by means of the bolts 52. Theseclamping plates are adapted to straddle the stem 49 so that the ball 48will be securely held in socket 46 but will be free for limitedoscillation in the socket. The yoke 50 embraces the rod 35 and is weldedor otherwise attached thereto so that the rod will be firmly connectedto the ball member so that the forces may be transmitted from thewalking beam 18 to the crank 25.

Obviously the connection between the ball 48 and the socket 46 willrequire considerable lubrication and for this purpose a valve has beenprovided on the rod or pipe 35 and may be of any standard type in orderthat lubricant may be injected. A small conduit 56 has been providedacross the inside of the pipe 35 so that the lubricant will bedischarged at the point 57 inside of the hollow stem 49. The hollow ball48 forms a chamber 58 which may act as a reservoir for lubricant so thatit may pass through theopening 49 to lubricate the surfaces between theball 48 and the socket 46.

Figure 3 shows the yoke 50 as being elonr gated so that it will embracea considerable portion of the rod or pipe 35 and insure a steadyconstruction.

The temper screw or bridle 20 is shown as attached to the walking beam18 by an apron 61 which is similar to the construction shown in myco-pending application, Serial No. 492,736, filed November 1, 1930.

It is intended in the further development of the invention that variouschanges and alterations may be resorted to in order to adapt the pumpingunit to peculiar conditions arising in actual practice. Broadly theinvention contemplates the assembly of all of the structure necessary'toperform the pumping or drilling operation upon a unitary frame work,which may be disposed on the derrick floor, and which may be moved fromplace to place without dismantling the arts.

Having described the invention, w at I claim is:

1. A pumping unit for use with a well rig pumping equipment, said unitincluding a housing, a crank shaft extending from opposite sidesthereof, a counter-balanced crank arm on each end of said shaft, and apitman straddling said pumping unit with opposite sides of its lower endattached to each of said arms, and having its upper end adapted forconnection to the wellrig pumping equipment.

2. A. 'umping unit including'a housing walking beam connected to the topof said pltman, and a crank shaft connected to each of the ends of saidpitman.

4. In a pumping unit a yoke-shaped pitman,- a walking beam, and abearing connects ing said pitman and beam including a ball, a stemthereon, said stem being afiixed to said pitman yoke.

5. In a pumping unit a yoke-shaped pitman, a walkingbeam, and a hearingconnecting said pitman and beam including'a ball, a stem thereon, saidstem being afiixed to said pitman yoke, and means on said pitman tolubricate said bearing.

6. In combination with a double crank arm, pumping unit a walking beam,an arm connected therewith, a pitman rod straddling said armandconnected to thecrank arms, and bearing means between said arm androd.

7. A pumping unit balanced to eliminate vibration and including adriving unit, a crank arm on each side thereof, a walkin beam centrallydisposed with respect to said unit, a single pitman connecting bothcrank arms to said walking beam, and a swivel bearing forming suchconnection whereby inequalities of adjustment may be absorbed.

In testimony whereof I hereunto afiix my signature this 10th day ofDecember, A. D.

WALTER C. TROUT.

a crank s aft extending from opposite sides thereof, a counter-balancedcrank arm on each end of said shaft, and a unitary yoke-shaped pitmanhaving its ends connected to said crank arms.

3. An assembly of the character described 1 including an invertedU-shaped pitman, a

